Charles a



No Model.) 0. A. SEELEY.

MAGNETO ELECTRIC MACHINE.

UNITED STATES PATENT OFFICE.

CHARLES A. SEELEY, OF NEW" YORK, ASSIGNOR TO JOHN HOOSIOK, N. Y.

1B. TIBBITS, OF

MAGNETO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 277,069, dated May. 8,1883.

Application filed January 3, 1881.

To all whom it may concern Be it known that 1, CHARLES A. SEELEY, acitizen of the United States, residing at New York, in the county andState of New York,

,5 have invented a new and useful Improvement in Magneto-ElectricMachines, of which the following is a specification.

In accordance with the invention herein described my improvedmagneto-electric ma- IO chine contains'no iron in its armature, and theparts of the machine are so combined that the electricity generated issimilar in character to that of the Gramme machine. The machine belongsto the class which is sometimes designated as continuous-currentmachines.

In the accompanyingdrawings, in which similar letters indicate likeparts, Figures 1 and 2 are end views of disk-armatures. Fig. 3 is a sideview of the armature field-magnets and commutator as combined in thecomplete machine; and Fig. 4 is a view of part of an armature, showing anovel method of winding the bobbins.

, My improved machine, as to its form, its

2 5 principal parts and their relation to each other, and the theory ofits operation, resembles the machines known as the Niaudet-Breguetmachine and the Farmer-Wallace machine. In such machines the armature isof a disk form.

The electromagnetic elements, with axes parallel to each other and tothe axis of revolu tiou, are arranged at the outer part of the disk, andthe bobbins are connected together to form a closed series, thejunctions of the bobbins being connected consecutively with the bars ofthe commutator.

The field-magnet system consists of two pairs of opposite magnet-poles,and its position with reference to the armature is illustrated in Fig.

.0 3, where S and N designate, respectively, the poles of the pairs. Themagnet-poles should be provided with pole-plates conformable to thecontour of the bobbins which are to be influenced by them. WVhen thearmature is re- 4 5 volved between the opposed poles of the pairs ofmagnet-poles, electric currents areset up in the armature-circuit insuch a way that a electrical consequent-pole is constantly maintained atthe partof the circuit between one of the pairs of field-magnet poles,and a consequent-pole between the other pair, and

(No model.)

the brush-contacts of the commutatorare therefore to be made with thecommutator-bars as they successively become connected with theseconsequent-poles.

My improvement in part consists in dispensing with the iron cores whichheretofore have been employed in the armatures of the machines abovedescribed. The armature of my improved machine is a series of short bob-()0 bins having no cores of iron, with axes parallel to the axes ofrevolution, connected outside toinside, and so on, so as to make acompletelyolosed circuit, the series of bobbins being held together bysuitable supports and stays. In 6 each of the drawings the position ofthe bobbins in relation to each other is shown. In Fig. l the connectionof the junctions of bohbins with the commutator-plates is shown. Thearmatures are represented in the drawings as containingtwelve bobbinseach; but in practice the number of bobbins may be greatly increased. Itwill be observed that when the wire is wound radially, as in Fig. 2, theproportion of the efficient to the inefficient wire 7 5 increases withthe number of the bobbins 5 also, the evenness of current increases withthe number of bobbins. A number less than twelve is not to berecommended. For a machine of large size one hundred would not be toomany. 86

Figs. 1, 2, and 4 show different sectional forms of bobbins. In myarmature only that part of the wire which may be computed as of a radialdirection is directly efficient in the generation of electricity, andfor this reason the 8 5 forms shown in Figs. 2 and 4 are greatly to bepreferred to that shown in Fig. 1. The armature as shown in Fig. 2differs from the armature patented by me June 22, 1880, in the fact thatthe bobbins of this specification are a 0 closed series, while theformer armature had bobbins with free ends. The bobbins of Fig. 4 arewound 011 a novel plan, and will probably be preferred. In these bobbinsthe median lines of the winding are radial in part, and the angles ofthe radial parts between successive bobbins are equal to each other, andalso equal to the angle of the radial parts formed by the in and outwinding at the interior of the bobbins, and also equal to the angle ofthe sector of the disk occupied by each of the bobbins.

The word bobbin is used in this specification as synonymous with theword coil, and magnetic cores and connected in closed circuit, to tosignify an electrical conductor Wound in a the said bobbins being soWound and arranged constant direction about an axis. that all the anglesformed by contiguous me- I claimdian lines of the winding shall be equalto each 1. An armature of a magneto-electric maother.

chine, in which coreless bobbins or bobbins CHARLES A. SEELEY.

having non-magnetic cores are connected in Witnesses:

closed circuit. E. GORDON,

2. A series of armature-bobbins Without] JAMES H. HUNTER.

